<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <Header :addTodo="addTodo"/>
        <List :todos="todos" :deleteTodo="deleteTodo"/>
        <Footer :clearAllDone="clearAllDone"/>
      </div>
    </div>
  </div>
</template>

<script>
import Header from "./components/Header.vue";
import List from "./components/List.vue";
import Footer from "./components/Footer.vue";

export default {
  name: "App",
  components: { Header, List, Footer },
	data() {
		return {
			todos:[
				{id:'987ysad',title:'吃饭',done:false},
				{id:'0dsfe82',title:'睡觉',done:true},
				{id:'i90dsji',title:'学习',done:false},
				{id:'89uwji7',title:'敲代码',done:true}
			]
		}
	},
	methods: {
		// 用于添加一个todo对象
		addTodo(todoObj){
			//find是有返回值的，若找到了返回该条记录，若找不到undefined
			const result = this.todos.find((t)=>{
				return t.title === todoObj.title
			})
			if(result){
				alert('输入重复，请重新输入！')
			}else{
				this.todos.unshift(todoObj)
			}
		},
		// 用于删除一个todo对象
		deleteTodo(id){
			//通过filter删除掉指定项
			const result = this.todos.filter( t => t.id !== id)
			//更新数据
			this.todos = result
		},
		// 用于清除所有已完成
		clearAllDone(){
			this.todos = this.todos.filter( t => !t.done)
		}
	},
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>